Debris Exclusion Function
The debris exclusion algorithm is designed to prevent false gas alarms by rechecking big shifts
in optics signal. However, high concentration gas may also cause a big shift. To differentiate
high concentration gas from debris, the debris exclusion algorithm observes the behavior of
optics signal after big shift. The debris exclusion algorithm may delay gas reporting by up to 10
seconds when big shift happens. A user may choose to disable debris exclusion algorithm when
high concentration gas is anticipated, and quicker gas alarm reporting is required. The default
setting is disabled.
Virtual Reference Function
The Virtual Reference option reduces the possibility that a non-gas event will result in a
concentration or alarm. When enabled, it maintains a record of specific monitor operation and,
in the event of a reading
¼ TLV or above, executes a confirmation before the concentration or alarm is issued. Once
confirmed, measurements for the same event will not be affected. See software 1.25.5 release
technote for further information.
The Virtual Reference function is user configurable by rack (it is disabled by default). See the
following table for the number of windows used and the time to confirm an event. The function
reduces the possibility that a non-gas event will result in a concentration or alarm.
Note: The Virtual Reference function is not used on CLO analyzers, even if enabled.
Chemcassette Number of Windows Pulled Time to confirm (sec)
Hydrides 3 15-25
XP Hydrides 3 15-25
Mineral Acids 6 30-40
Cl
2
/Oxidizers (NO
2
) 6 30-40
Mineral Acids (Pyro) 6 30-40
Phosgene 6 30-40
XP Phosgene 6 30-40
Aliphatic Amines 3 15-25
Cl
2
/Oxidizers-III 6 30-40
Hydrogen Cyanide 3 15-25
Hydrogen Sulfide 3 15-25
XPV Chlorine 6 30-40
XPV Chlorine-II 3 15-25
Fluorine/Oxidizers 3 15-25
Vertex M 65 User Manual
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